To this end, NeXT released NEXTSTEP for Intel, Sparc, and HP which allowed the software to run on Intel 486 and Pentium processors, as well as Sun SPARC-based computers and Hewlett-Packard HP-UX workstations. NeXT continued to produce the NEXTSTEP operating system until release version 3.3 and created the OpenStep API specification for operating systems in conjunction with Sun Microsystems.
thanx,
bill